The Organola and Trichord are on the same page because both had the Stradella bass system. The Trichords were actually mixed. Some of the early Trichords had a Diatonic bass; others had the Stradella. Later models had a Stradella bass and the off-set bass keys usually associated with the Stradella bass.

Jimmy Shand had an Organola in the early ’30’s - below.

The above Trichord has a Stradella bass.

The red Trichord on the left has a Diatonic bsss. The Hohner ad below shows a Trichord with the off-set bass rows for a Stradellla bass.

Trichord construction details shows 4 1/2 reed blocks and keytop/pallet layout, which is different than the Corona 3R.